Windows Live Writer

I've been using Windows Live Writer for months with no problem. This weekend an error code started & I've been unable to open the program.
The error reads :
windowslivewriter getsidebarcontentsource system.nullreferanceexcempt

The log file reads
Event Type Windowlive writer
P1:create Handle,
P2:127,
P3:system.objectdisposedexception
P4: 12.0.1367.1128
P5: 2.0.50727.1378
P6: windowslivewriter.
Ms Windows online assistance suggested reinstalling WLW which I did but no changes. I'm wondering if there might be a XP component that could have been corrupted that would cause this.... any suggestions / incite before I start reinstalling XP???
Thanks

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ITtoolbox windows-xp-pro-lMate I don't know much about WLW but in case it is a win XP component causing the problem, try running System file checker. Go to start, Run, sfc /scannow

You will possibly be asked for your installation CD to replace files that may have been changed / corrupted since XP was installed. If that doesn't work, then a repair install might be needed. Cheers Gazza

Yo Gazza, Windows Live Writer is part of the MSN Live Messenger pack, it's
an optional install when you install MSN Live Messenger, basically it
enables you to write a weblog using your MSN Live ID.

Regards Lee

A few questions to answer before posting:
What does the error say? Does it have an error code? e.g 0x0000008e, Which
Software Version are you using? e.g Office 2003, What is the make and model
of the hardware? Epson R300 printer etc, What was the last thing you did or
installed before the problem started? What have you already done?

What NOT to say:
My PC isn't working can you help me? Vague questions get Vague answers

What TO say:
If someone gives you the solution to your problem thank them, also thank the
other people who took the time to help you. Tell everyone the the solution,
when a variety of solutions have been suggested we need to know which one
worked and if you did any additional work.